Lockstitch sewing machine



X577. egw v y v Oct. 25, 1938. N. v. cHRls'rENsEN ET AL 2,134,552

LOCKSTITCH SEWING MACHINE .WITNESSES: I N VEN TRS:

Oct. 25, 1938. N. v. cHRls'rENsEN Er AL LOCKSTITGH SEWING MACHINE 7 Sheets-Sheet 1 Filed DSC. 9, 1935 A Oct. 25, 1938. N. v. cHRlsTENsN ET Al. 2,134,652

LOCKSTITCH SEWING MACHINE Filed nec. 9, 1955 l 7 sheets-sheet 5 WITNEssEs.- INVENTORS.:

5'@ mrmmmrzmme 05mm gunst,

Oct. 25, 1938. N. v. cHRlsTENsEN ET AL v2,134,552

LOCKSTITGH SEWING MACHINE Filed Dec. 9, 1955 7 Sheets-Sheet 4 7 EIGL m* WITNESSES.- INVENTORS:

TTORNEYS.A

Oct. 25, 1938-. N. v. cHRlsrl-:NSEN ET AL 2,134,652

LocKsTITcH SEWINGY MACHINE Filed Dec. 9, 1935 7 Sheets-Sheet 5 ORNEYS.

Oct. 25, 1938.' N. v. cHRxsTENsEN ET AL 2,134,652

LOCKSTITCH SEWING MACHINE Filed Deo. 9, 1935 7 sheets-sheet e E [Q 'Zl WITNESSES: I N V EN TORS.'

if TORNEYS.

OCt- 25, 1938. N. v. cHRlsTENsEN ET A1. 2,134,652

I LOGKSTITCH SEWING MACAHINE Filed nec. 9, 1955 7 sheets-sheet 7 I 50km W5 650, Z

Patented Oct. 25, 1938 UNITED STATES PATENT oFFicE 2,134,652 Locxs'rrron SEWING MACHINE Norman V. Christensen and Oscar Quist, Chicago, Ill., assignors to Union Special Machine Company, Chicago, Ill., a. corporation of Illinois Application December 9, 1935, Serial No. 53,552 18 Claims. (Cl. i12- 184) 'This invention relates to lock stitch sewing ma- With more detailed reference first t0 Figschines; and it is concerned with both single and I-VIII of these illustrations, the Sewing machinev multiple needle lock stitch sewing machines therein delineated for the purposes of exemplifyf wherein the rotary loop takers or hooks are aring 0111 inVentiOn has a frame With i1 hOIiZOntal 5 ranged vertically with their 'axis parallel to the bed plate or work support I which is, overhuns 5 needles. by a. hollow horizontal arm 2 that reaches for- In connection with machines of the above rewardly from an integral hOllOW Standard 3 11D- vferred to type,. We aim, through simplified constanding from the work support at the right hand struction, to facilitate assembling of the machines end as Viewed in Fig- I. Guided fOr Vertical moveinitially, and to lenable adjustment of'the rotaryl ment in the head 4 at the free'end of the arm 2 10 hooks relative to the needles for precise cooperais a needle bai' 5 Carrying 'a' needle 5, and a tion with the latter. I presser bar 1 which is subject to a regulatable A further object of our invention is to make it compression'spring 3 (Fia. III)- nd t0 the 10Wer possibleto eiect the adjustments of the rotary end of which is secured a presser foot 9- The l5 hooks easily and quickly without necessitatingv needle bar 5 is reciprocated by virtue of coordina- 15 disconnection of the means by which they are tion. through a link I0 with a crank pin I I on directly driven and without disturbing the timing a eounterweighted crank arm I2 at the forward of said hooks in respect to the needles. y end 0f the main Shaft "3 Of the machine Within Other objects and attendant advantages of this the head 4. said Shaft extending longitildinally invention will appear from the following detailed through the hollow 0f the aIln 2 and'being jour- 20 description of the attached drawings, wherein naledn bearing bushings I4 and l5 Set inte-the Fig. I is a view partly in longitudinal section machine frame. As shown in Fig. I the main and partly in side elevation of a single needle lock Shaft I3 extends Outward through the bearing stitch machine'conveniently embodying the presbushing l5. and t0 its DIOtlnding end is Seemed ent improvements. a combined hand and belt wheel I6 so that it can 25 Fig. II is a fragmentary view in side elevation be rotated either manually or by power. The of the head of the sewing machine. needle thread takeup I'I operates through a ver- Y Fig. III shows the front end elevation of the tical slot I8 (Fig. II) in the front side of the head machine. Il, and within the latter, it is pivotally connected Fig. IV is an inverted plan view of the mamedially at I9 to a lazy bar 2|) fulcrumed on a. 30 chine. xed lug 2|, while its inner end is connected to Fig. V is a. transverse sectional view taken as another crank Din 220D the erenk arm |2- Enindiceted by the arrows V-Vin Figs. I and 1V, route to the needle 6, the needle thread (not Fig. VI is a fragmentary detail sectional view shown) is directed by guides 23 and 24 t0 Pass 33 takenas indicated by the arrows VI-VI in Fig. between the disks of a. tensioning device 25, 35

IV- thence through the eye of the takeup Il, thence Fig. VIIis a fragmentary longitudinal sectional through anOthel peil' 0f fXed guides 25 and 27 view taken as'lndcated by the arrows VIIdVlI in the interval between which it is engaged by a in Flgs.'I.V and VI. c hook 28 reaching outward from a collar 29 fixed 40 Fig. VIIIis a fragmentary detail plan sectional on the presser bar 1. A lateral projection 3U 'on 40 view taken as indicated by the arrows VIII-VIII the collar 29 engages a vertical slot in the head in Fig. I. 4 to prevent thepresser bar 1 from rotating inci' Fig. IXis a view `corresponding to Fig. I of a dent to up and down movement thereofl as differtwo-needle lock stitch sewing' machine embodying ent thicknesses of fabric pass beneath the presser 0111' inVentiOnfoot 9. The presser bar I is lockable in elevated 45 Fig. x is a fragmentary view showing the head position by means of a lifting oem meer 3|; of the machine in side elevation. t and in order that it may be raised and lowered Fig. XI is an elevation of the front end of the during sewing, there is provided a knee or pedal two-needle machine. operated control arm 32 which is coupled by a t0 Fig. X11 isa fragmentary detail sectional View link 33 with the collar 29. When the control arm 5gv taken as indicated by the arrows XII-IUI in 32 is actuated,acam projection 34 thereon pushes 'Fg XI; and the stem 35 of the tension device 25'forwa'rd to Fig. a detailplan sectional view taken relieve the tension on the needle thread. The as indicated by the arrows XIII-XIII in Figs. features thus far described are all well known in IX and n. the art. i Y

perating beneath the work support I within the openings of the throat plate 36` (Fig. VII) of the machine and opposing the presser foot 9 is a feed dog 31 which is secured, with capacity for vertical adjustment, to a feed bar 38. As shown in Fig. III, the feed-bar 38 has a downwardly and forwardly curved arm 39, which, at 40, has pivotal connection with the strap 4I of an eccentric 42 at the front end of a transmission shaft 43 extending longitudinally of the bottom of the work plate I and so receives its rising and falling movements. As shown" in Fig. VII, the feed bar 38 and the feed lift strap 4I and eccentric 42 lie, one above the other in the vertical plane of the needle 6. The feed movements are imparted to the feed bar 38 from another eccentric 45 (Figs. I, IV and V) on the transmission shaft43, the strap 46 of said eccentric having pivotal connection at 41 with a'lazy bar 48 fulcrumed at 49.0na pendant lug 59 of the work support I, as well as with one end of a link 5I, which, at its other end, has anadjustable pivotal connection at 52 with a curved slotted arm 53 on a rock shaft 55. This rock shaft '55 is journaled in pendant lugs 56 and 51 of thel work plate I, and to its forward end (Figs. III and IV) is secured an upstanding bifurcated arm 58, which has a pivotal connection 59 with the outer end of the feed bar 38. The transmission shaft 43, sec Figs. I and IV, is journaled at an intermediate point in a xed bearing 60 and has its rear end extending through a bearing bushing 6I into a lubricant reservoir 62 below the work plate I, which reservoir communicates directly with the hollow of the standard 3, and which has a removable bottom plate 63` as well as a removable filling hole plug 64. By means of a train of intermeshing gears 66, 61 and 68 within the l December 17, 1935 in the name of George Sauer.-

Having now generally indicated a type of sewing machine suitable to the embodiment of our needle and above the shaft 43. As shown in Fig.

VII, the rotary hook shaft 66 fits downwardly into a sleeve 61 which is journaled in a bearing bushing 68 set into a Journal member 69. At its lower end, the hook shaft 66 is formed with a tongue 10 that engages a transverse slot in a plug 1I xed within the bottom of the sleeve 61. 'I'hc rotary hook 65 is held in position by a headed axial screw 12 whereof the shank passes down through the hook shaft 66 and engages the plug 1I. Obviously, upon removing the screw 12, the rotary hook 65 can be lifted out of the machine from abovewhen required, and replaced without changing its timing with relation to the needle or feed movements. The sleeve 61, it will be noted, extends downward into a lubricant chamber 13 afforded by the journal member 69, and at its bottom end within said chamber terminates in a bevel gear pinion 15 which meshes with the top of a driving bevel gear 16 on the transmission shaft 43. Due to this arrangement of the later on described. The ratio-of the gears 15 and 16 in the present instance is such that the rotary hook 65 is revolved twicefor each reciprocation of the needle 6. The gear wheel 16 is not directly.

attached to the transmission shaft 43, but secured, by a set screw 11 to a sleeve 18 which extends outward through a bearing bushing 18 in one of the side walls of the lubricant chamber 13. 'I'his sleeve 18 is split at its projecting end as shown in Fig. VII and provided with a screw by which it is clamped fastl to the transmission shaft 43. As a consequence of this construction it is possible to adjust the gear wheel 16 circumferentially of the shaft 43 to change the timing of the rotary hook 65 without the necessity for removing the bottom cover 8| of the lubricant chamber 13 which latter serves as a housing for the two bevel-gears. Axial displacement of the sleeve 18 is prevented by engagement of the hub of the gear wheel 16 with the inner end of the bushing 19 fast in the wall of the housing 69, and by engagement of a collar 82 on the projecting end of said sleeve with the outer end of said bushing. As shown'in Fig. VI, the journal member 69 is formed with a groove 83 which engages -a lateral horizontal tongue 84 at one side of a longitudinally-extending pendant flange 85 of the work support I and is secured by a headed clamp screw 86 whereof the shank passes through a horizontal slot 81 in said flange, see Figs. I, VI and VIII. By virtue of this arrangement, the wholeV rotary hook,unit comprefreeing the latter on the shaft 43, be shifted along 'said shaft and the ange 85 of the bed plate I to adjust the rotary hook 65 laterallydn respect to the needle 6, such adjustment being accomplished without disengagement between the hook driving bevel gears 16 and 16 since these are both carried by the housing 13, and without changing the timing of said hook in respect to the needle 6. As shown, the side of the housing 13- contiguous to the needle 6 is fiat and vertical with the periphery of the rotary hook 65 overhanging it and extending over the feed bar 38 and the feed lift strap 4I and eccentric 42. This construction and arrangement is advantageous in that it permits close adjustment of the rotary hook 65 relative to the needle 6 incident to positional shifting of -the unit 88 along the shaft 43. The sleeve 18 is lubricated by oil introduced through a vertical duct 89 in the journal member 69, see Fig. VII. The transally adjusted when required. Aside from the' consideration of ready adjustment, the manner of mounting the rotary hook unit 88 and the end bearing bracket 90 for the transmission shaft 43 obviously facilitates assembling of the Imachine initially at the factory, and, moreover, makes possible easy and quick removal of said unit and bracket in the event that their replacement is necessitated by reason of derangement or wear. Moreover, by providing the journal bearings 60 and 9U for the shaft 43 at opposite sides of the driving connection for the rotary hook 65,

said shaft is effectively steadied in its rotation at 75 ing of the units 88, 88a along thev shaft 43. In .L view of the general similarity between the two` vmachines, all corresponding parts other than high speeds with attendant absence of vibration. a

the flange 85 for adjustment of the hook relative to said needle, and fixable in adjusted positions by the clamp screw 86. The rotary hook unit 88a, associated with the needle 6a, it will be observed from Fig. XII, is a reverse or left hand duplicate of the unit 88 with corresponding parts identified by the same reference numerals heretofore employed -except for addition inA each instance of the letter a for the purposes of distinction. The unit 88a is independently shiftable along the flange 85 for adjustment of its rotaryVA hook lia'relative to the corresponding needle 6a. In the two-needle machine, the unit 88a takes the place of the bearing bracket 90' of the single needle machine in affording journal support to .the front end of the transmissionshaft 43. ,The thread for the additional needle 6a in the machine of Figs. IX-XIII is tensioned by a tensioning device a like the tensioning device 25 and directed Yto a definite course by suitably positioned additional guides 23a, 21a on the head 4. It will be especially noted from Figs.

XII and "X111 that the feed bar 38and the feed lift eccentric' 42 and strap Il in this instance lie, one above the other, in a vertical plane centrally between the two needles 6, 6a. With'the peripheries of the two cooperating rotary hooks 65, 65a

overhanging the contiguous at vertical sides of the housings 1313a which enclose the gear sets 15, 16, and 15a, 16a. This construction and arrangement not onlyv favors close spacing of the needles 6, 6a, but makes possible close adjustment of the rotaryhooks 65, 65a relative to each other and to said needles upon positional shiftthose particularly referred to, have been identified by the same reference characters previously .member affording a lubricant chamber into 60 which both the transmission and rotary hook shafts extend; a gear Wheel on the rotary hook shaft within the lubricant chamber, an intermeshing gear wheel'also 1within the lubricant chamber; a vsleeve whereon the last mentioned gear lwheel is mounted surrounding the transmission shaft and extending to the exterior of said chamber; securing means externally of the lubricant chamber whereby the sleeve. is secured to the'transmission'shaft with capacity for circumferential adjustment to change the timing of the rotary hook. Y

2. .In a lock stitch sewing machine, a frame;v

a needle; a transmission shaft; a rotary hook unit includinga rotary hook having its shaft parallel with the needle and at right angles to the `transmission shaft, a journal member affording a lubricant chamber into which both the 4transmission and rotary hook shafts extend, a

gear wheel on the rotary hook shaft within the lubricant chamber, an intermeshing gear wheel on a sleeve'surrounding the transmission shaft and extending to the exterior of the lubricant chamber, means externally of said chamber whereby the-sleeve is secured to the transmission shaft with capacity for circumferential adjustment to change the timing of the rotary hook; and means for securing the rotary hook unit to the frame of the machine with capacity for being shifted along the transmission shaft to adjust the rotary hook laterally relative to the needle.

3. In a lock stitch sewing machine, a work support with a pendant flange; a transmission shaft below the work support parallel'with the fla-nge; a rotary hook unit including a vertical rotary hook, a shaft for the rotary hook, a journal member affording a lubricant chamber into which the transmissionshaft and the rotary hook shaft extend, and a pair of gears within the lubricant chamber interconnecting said shafts; and means for securingthe rotary hook unit to the flange of the work support with capacity to be shifted along the transmission shaft to adjust the rotary hook laterally relative to the needle.

' cluding a rotary hook with its axis parallel to the needle, a drive shaft at right angles to the rotary hook axis, gearing interconnecting said rotary hook, and the shaft within a housing, and means exteriorly of the housing whereby said rotary hook can be adjusted laterally of the needle as well as circumferentially about its own axis.

6. In a lock stitch sewing machine, a needle; and'complemental stitch forming mechanism including avertical rotary hook, a horizontaldrive shaft, gearing interconnecting said rotary hook and said shaft enclosed within a housing, and means exteriorly of the housing whereby said rotary hook can be adjusted 4laterally of the needle as well as circumferentially about its own n axis. v

'7.` In a lock stitch sewing machine, a frame; a plurality of needles; cooperating rotary hooks having their shafts parallel with the respective needles; a transmission shaft at right angles to the rotary hook shafts; journal members for the respective rotary hook shafts independently slidf able along the transmission shaft to permit independent adjustment of thev hooks laterally relative to the respective needles; vand means for securing the journal membersin adjusted positions to the machine frame.

, 8. In a lock stitch sewing machine, a plurality of needles;l cooperative rotary hooks having their shafts parallel with the respective needles; a transmission shaft at right angles to' the rotary hook shafts;,gear wheels on the respective hook shafts; gear wheels on the transmission shaft respectively in mesh' with the gear 4 alarmasl wheels on the hook shafts; journal members for the several rotary hook shafts slidable independently along the transmission shaft together with the coupled gears to permit independent adjustment of the rotary hooks relative to the respective needles; and means for securing the journal members in adjusted positions.

9. In a lock stitch sewing machine, a frame; a transmission shaft; a plurality ofneedles; and rotary hook units, including rotary hooks having their shafts parallel with the respective needles and at right angles to the transmission shaft, journal members affording lubricant chambers into which the transmission shaft and the corresponding rotary hook shafts extend, pairs of intermeshing bevel gears interconnecting said transmission shaft and the rotary hook shafts within the lubricating chambers; and means for securing the rotary hook units to the frame of the machine with'capacity for being independently shifted along the transmission shaft to adjust the rotary hooks laterally relative to the respective needles.

10. In a lock stitch sewing machine, a frame; a plurality of needles; a transmission shaft; cooperating rotary hooks having their'shafts parallel with the respective needles and at right angles to the transmission shaft; journal members affording lubricant chambers into which the transmission shaft and the respective rotary hook shafts extend; gear wheels on the rotary hook shafts within the lubricant chambers; corresponding intermeshing gear wheels also within the respective lubricant chambers; individual sleeves whereon the last mentioned gear wheels are mounted surrounding the transmission shaft and extending respectively to the exteriors of said chambers; and securing means externally of the lubricant chambers whereby the sleeves are secured to the transmission shaft with capacity for independent circumferential adjustment to -change the timing of the corresponding rotary hooks.

11. In a lock stitch sewing machine, a frame; a plurality of needles; a transmission shaft; rotary hook units including rotary hooks having their shafts parallel with the respective needles and at right angles to the transmission shaft, journal members affording lubricant chambers into which the transmission shaft and the respectivev rotary hook shafts extend, individual gear wheels on the rotary hook shafts within the respective lubricant chambers, intermeshing gear wheels respectively on independent sleeves surrounding the transmission shaft and extending to the exteriors of the lubricant chambers, and means externally of said chambers whereby the sleeves are secured to the transmission shaft with capacity for independent circumferential adjustment to change the' timing of the rotary hooks; and means for securing the rotary hook units to th frame of the machine with capacity for being independently shifted along the transmission shaft to adjust the rotary hooks laterally relative to the respective needles. y

12. In a lock stitch sewing machine, a work support with a pendant flange; a plurality of needles; rotary hook units including vertical rotary hooks to cooperate respectively with said needles; and journal members for thefvshafts of said rotary hooks having tongue andg'roove connections with the work support to enable independent adjustment of the rotary hooks laterally relative to the respective needles; means for securing the rotary hook units in adjusted positionsl to the flange aforesaid; and means for driving the rotary hooks.

13. In a lock stitch sewing machine, a work supportl with a pendant flange; a transmission shaft below the work support parallel with the flange; a plurality of needles; rotary hook units including vertical rotary hooks to cooperate with the respective needles, journal members affording lubricant chambers into which the transmission shaft and the individual rotary hook shafts extend, and pairs of intermeshing gears within the lubricant chambers interconnecting the transmission shaft with the corresponding hook shafts; and means for securing the rotary hook units to the flange of the work support with capacity for independent shifting along the transmission shaft \to adjust the rotary hooks laterally relative to the respective needles.

14. In a lock stitch sewing machine, a plurality of needles; and complemental stitch forming mechanism including vertical rotary'hooks to cooperate with the respective needles, a horizontal drive shaft, gearing interconnecting said rotary.

hooks and said shaft within separate housings, and means exteriorly of said housings whereby said hooks can be independently adjusted laterally of the respective needles as well as circumferentially about their own axes.

`15. In a lock stitch sewing machine, a plurality of needles; and complemental stitch forming mechanism including rotary hooks with axes parallel to the respective needles, a drive shaft at right angles to the rotary hook axes, gearing interconnecting said rotary hooks and the drive shaft Within separate housings, and means exteriorly of said housings whereby said hooks can be independently adjusted laterally of the respective needles as Well as circumferentially about their own axes.

16. In a lockstitch sewing machine, a needle; a horizontal shaft effecting reciprocation of the needle; aV vertical shaft carrying at its upper end a rotary hook to cooperate with the needle; a bevel gear at the lower end of the vertical hook shaft; a shaft extending parallel with the needle shaft carrying a bevel gear which at the top meshes with the bevel gear on the vertical hook shaft; and a train of spur gears interconnecting said needle and parallel shafts.

17. In a lock stitch sewing machine,` a work support; a needle operative above the work support; a longitudinally extending rotary shaft beneath the work support; feeding means below the Work support including a feed bar and a feed lift eccentric on the shaft, one above the other in the vertical plane of the n eedle; a.-,rotary hook having its axis parallel with the needle; a gear set coordinating the rotary hook with the shaft; and a housing positionally shiftable along the shaft and enclosing the gea'nset, the side of the housing contiguous to the needle being flat and vertical with the periphery of the hook overhanging it and extending over the feed bar and the feed lift eccentric to enable close adjustment of said hook in respect to the needle.

18. In a lock stitch sewing machine; a work support; a pair of laterally spaced needles operative above the work support; a longitudinallyextending rotary shaft beneath the work support; feeding means below the work support lncluding a feed bar and a feed lift eccentric on the shaft, one above the other in a vertical plane centrally of the needles; a pair of cooperative rotary hooks having their axes parallel with the needles; gear ysets respectively coordinating the rotary hooks. with the shaft; and housings separately positionaliy shiftable along the shaft vand enclosing the gear sets, the contiguous sides of the housings beingiat and vertical with the peripheries of the rotary hooks overhanging them and extending over the feed bar and the feed lift eccentric, thereby permitting close spacing of the needles and close adjustment of said hooks relative to each other and to the needles.

NORMAN V. CHRIS'IENSEN. OSCAR QUIST. 

